The roar of the air screws momentarily drowned the shouting; then, as the machine touched the ground and the engines were turned off: "We–want–the whip; we–want–the whip," broke out again in the same loud, insistent monotone.

There are no more uses of "monotone" in the book.

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with an expressionless face and a monotone voice

The quiet, dreary monotone in which he habitually spoke quickened a little under his present excitement.